However, Martin said that the sensitive nature of the Navy Yard didn't impact his and his colleagues' decision to ban it. Instead, he cites the rules of Reddit as the reason for banning the Navy Yard group, which he said was meant to be a joke.

"This subreddit still encouraged users to directly submit personal information, even if it was a joke," said Martin. "Our policy is and has always been no posting of personal information under any circumstances."

In the aftermath of the Boston Marathon bombings this past April, members of Reddit and other social communities took it upon themselves to find clues as to who did it. A Reddit group devoted to finding the Boston Marathon bombers looked at photos of the exploded bags and compared it to photos of specific people crowd in the marathon crowds before the bombings.

Reddit administrators removed posts that speculated whether the people tagged were the actual bombers or not, especially after a Reddit user said that one of the circled people saw that his Facebook information was leaked.

"It was a joke. No one in there was sincerely trying to find the Navy Yard shooter," Martin said.

"There were only six posts to this subreddit and only five comments total," he said. "There was not a lot of traffic going to this group."

If Reddit users wanted more information about the Navy Yard incident, Martin points to the Washington DC group. "The DC subreddit was very informative. There, some users kept an update on what schools were shut down and other users who worked in buildings around Navy Yard shared their feelings," he said.